Electric riveting-machine.



A. C. TAYLOR.

ELECTRIC RIVETING MAGHl-NE.

APPLICATION FILED SEPT-1.9.1916.

Patented Apr. 9, 1918.

3 SHEETS-SHEET l- A TTOR/VEYS v Patnted Apr. 9,1918;

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ELECTRIC RIVEVTING MACHINE.

APPLICATION FILED. SEPT. 19, 1916.

A TTOBNEYS UNITED STATES PATENT orrron.

ALBERTIS C. TAYLOR, F WARREN, OHIO, ASSIGNOR TO THE WINFIEL'D MANUFAC-TUBING COMPANY, OF WARREN,OHIO,-A CORPORATION.

" ELECTRIC RIVETING-MACHIITE.

Specification of Letters Patent.

Application filed September 19 1916. Serial No. 121,026. I v

To all whom it may concern:

Be it known that I, ALBER'rIs C. TAYLOR, a citizen of the United States,residing at Warren, in the 'county of Trumbull and State of Ohio, haveinvented certain new and useful Improvements in ElectricRiveting-Machines, of which the following is a specification.

In the accompanying drawings, Figure 1 4 is front elevation of themachine, and Fig.

2 is a vertical central sectional elevation thereof front to rear. Fig.3 is a cross section on line 33, Fig. 2.

Fig. 4, Sheet 3, is a side elevation of the upper portion of the machineviewed from the right of Fig. 1 and Fig. 5 is an elevation of theopposite side from Fig. t with the fly or band wheel sectioned away anddisclosing the clutch mechanism in full lines. Fig. 6 is a sectionalplan view on the line 66, Fig.5, showing the clutch mechanism in sectionand engaged. Fig. 7 is a section on line 7-7, Fig, 5, Figs. 8 and 9 aredetails of the bolt and plunger employed in the clutch mechanismhereinafter described.

The invention herein is a modification of the machine shown in'acontemporaneous application filed by me and bearing Ser. No.

- leading up to and adapted to give contact and operating efi'ect to theriveting members a and b. These members, referred to herein aselectrodes or dies, since they serve to electrically heat and upset therivets, are suitably shaped at their ends to engage the head andthe-point of the rivet, respectively, the lower electrode beingsubstantially stationary and the upper electrode movable verticallywithin limits to rest down upon the rivet T, which is first placed inthe stock 8.

In riveting operation the first step is to bring the electrodes intoacting position on the rivet, as seen in Fig. 2, and this brings therivet into the electric circuit when the same is closed through thetransformer 72 and the electrical connections broadly indicated by 4which carry the electrodes in their terminals. The upper electrode a iscarried by a yoke aarranged to slide independently upon the head h, andsuitable nuts and a screw (1 serve to adjust and fix the yoke andelectrode in different positions to facilitate operation. Head h isslidably supported in the main frame F having side guides engaging theedge thereof,

' and a weight 'w suspended by a cord or cable is and sheaves Sand Sserves to overbalance the head and raise the electrode a to promote asafeand easy operation thereof through the hand lever 3, Fig. 4. Thesaid lever is mounted on a pivot shaft 9 in the body F and which shaftcarries a toothed segment 16 engaging a rack-bar or rod 10 bearing atits lower, end against a lug on the rear of head h and slidablevertically in suitable supports in said body, the said rod servingtolower said head and the upper electrode thereon within prescribedlimits.

In this machine it is necessary to have the counterweight w heavier thanthe slide it as there is no other means of raising the e1ectrode a. Therack 10 is not attached to the slide but only bears on projections inthe rear. If this rack were attached to the slide when the treadle wastripped, the slide it would travel down and hit slide it and cause thehand lever to come down at a high rate of speed which would be liable toinjure the operator. Lever 3 thus becomes the initial actuating memberto seat the upper electrode on the rivet, and in the present machinelever 3 also carries an electrical switch. comprising a hand grip 3pivoted on the extremity of said lever and having a right angledextremity in which a contact 0' is mounted. lhe other contact point a isfixed on or in a right-angled projection on the ends of lever 3, and afairly stifi' Patented r. 9, 1918.

compression spring 13 is interposed between said right angledprojections and keeps the said contact-pointsnormally apart. It followsby this separation of the said contacts and support of grip 3 that thehead 72.- can be depressed or lowered to rest the upper electrode on therivet before the said compression spring will yield enough to bring thesaid contact points together. Then, however, upon the exertion offurther down pressure upon said grip 3' the said contacts will be closedand the electric circuit of which-they constitute a part will also beclosed on the transformer and the rivet will be almost instantly heatedto an upsetting temperature without materially heating the electrodes.Then a very little further depression of the lever will upset the rivetmore or less completely and leave the work to be absolutely completed bythe power mechanism.

To this end I employ the power shaft m which has a slight crank 8 withwhich the coupling rod 7 is suitably connected, and a plunger head It isengaged with said rod and slidably mounted in said guides in headh,.Fig. 3. The head it has a projection or lug 15 at its bottomimmediately over electrode a upon which the plunger h is adaptedto bearon its downward thrust, and the presentplan of the machine contemplatesa sieigle power stroke through these parts as su cient to complete theriveting. However, additional strokes can be delivered if re uired.

ngagement with the power mechanism is effected through a clutchmechanism on shaft m and adapted to make operating engagement with .theconstantly revolvingwheel n, which is otherwise free to rotate on saidshaft, Fig. 6. The hub of. said wheel has a recess or hole 34 on itsinside, and a collar 35 fixed on shaft m carries a bolt 33 adapted to bethrust into said hole or recess by pressure of the spring 41 behind thesame when the wheel turns to engaging position, assuming said bolt to befree or released. However, said bolt is held back by means of a springpressed plunger 39, having a tooth or point engaging in a recess or holein the side of said bolt, Fig. 6, and

the said plunger in turn is held back against the pressure of its ownsprings 42 by a pivoted detent or dog 38 having a tooth 45 normallyengaging in a hole in the side of said plunger, Fig. 7. In this retiredand normal position of the said parts the wheel n is rotating and shaftm is at rest. The detent 38 is pivoted between its ends in a pivotedlever 40 and becomes the medium for withdrawing the plunger 39 from bolt33 when said lever is actuated by the treadle mechanism provided forthis purpose and which comprises the treadle 26, links 30 and 32 andlever 31 connecting said links. This frees said bolt for lockingengagement with wheel n.

After a single revolution of said wheel the bolt is automaticallywithdrawn first by a cam 36 on collar 35 engaging a beveledlug 37 on thesaidfdetent, which is now in engagenient with the plunger 39 and carriesit back against its springs 42 and disengages bolt 33. Then as said boltis carried around a short distance by the wheel the beveled shoulder 48thereon engages the beveled surface 46 on the plunger and the bolt iswithdrawn from the Wheel and ressed back far enough to be again engagedbger and locked in retirement. As to this mechanism and operation it maybe said that the same is shown and claimed in the application abovereferred to and therefore Yoke a provides an adjustable holder for theupper electrode a and a terminal for the flexible. laminated transformerbands 4, while head it is a carrier for said parts which is operablydependent upon power applied through three sources, to wit:the rack bar10 which serves as a presser member, the slide h which operates as astriker or hammer, and the weight W or its equivalent which causes anuplift of the head and affords an elastic or yielding connection adaptedto maintain working relations between the independently movable parts.

lVhat I claim is:

1. In a machine as described, a pair of electrodes, a movable headcarrying one of said electrodes and means to actuate said headcomprising a rack separably engaged with said head, a weight to holdsaid head and rack in working relation, and a lever and tooth ijegmentto actuate said rack.

2. A machine as described having a pair of opposed electrodes, and meansto raise and lower the upper of said electrode comprising a slidablehead and a separate rack slidably mounted to bear down on said head, ahand lever and a toothed segment operated thereby engaging said rack,and a counterweight to maintain said head in bearing engagement withsaid rack, in combination with a power device to depress said headindependently of said rack.

3. A machine as described having a pair ythe plunof alined electrodesand means to raise and lower the upper of said electrodes and to turnthe electric current thereon comprising a sliding head carrying the saidupper electrode, a rack and a lever'and a toothed segment to actuatesaid head initially, electric contact points mounted on said lever andadapted to close the electric circuit on said electrodes durin theinitial stages of operation, and power means to operate said headfinally and independently of said rack and lever mechanism. i

4. The machine described having two electrodes and means to raise andlower the upper electrode. initially comprising a lever to actuate saidupper electrode provided with electrical contacts and means on saidlever to close said contacts and turn the current on said electrodes, incombination with a slide and power means to actuate said headindependently of said lever.

' 5. The machine described comprising a sliding head and an electrodethereon, a rack fixed on said head, a lever and segment to operate saidrack, and an over-balancing weight connected with said head to 8. Themachine described, comprising a pair of electrodes and a head carryingthe upper electrode, a plunger slidably mounted in respect to said headand adapted to bear thereon and power shaft and crank to actuate saidplunger.

.9. The machine described, comprising a slidable head and an electrodefixed thereon, in combination with a plunger slidably mounted on saidhead and adapted to depress the same and a crank shaft and coupling rodoperated thereby in actuating relations with said plunger.

10. An electric riveting machine having a slidable head and means tooperate the same, and an electrode having a supporting member slidablyengaged with said head and means to fix said member and electrodeadjlstably at different elevations upon said hea 11. An electricriveting machine having a vertically-movable head and a slidable yokeand a screw and nut to fix said yoke ad justably upon the bottom of saidhead, an electrode carried by said yoke, and means to operate said head.

12. In an electric riveting machine, a set of opposed electrodes, avertically-movable head for one of said electrodes, a presser member inseparable bearing engagement with said head, means to operate saidpresser member, a hammer in striking engagement with said head, means tooperate said hammer, and means to maintain operable engaging relationsbetween said independently movable parts.

13. In an electric riveting machine, a set of electrodes, avertically-movable tread having a terminal holder'for one of saidelectrodes, a presser member bearing upon said head, a hammerin strikingrelation with said head above said electrode, a device to produce aconstant uplift upon said head, and separate mechanisms to operate saidhammer and presser member, respectively.

14. In an electric riveting machine, a set of opposed electrodes, aslidable head carrying one of said electrodes, self-acting means toraise said head, ahammer in striking relation opposite said head,power-operable means to actuate said hammer, a slidable presser bar inbearing engagement with said head, and manually-operable means toactuate said presser bar.

15. In an electric riveting machine, an upperand a lower electrode andmovable holders for each,'a device to apply pressure on the upperelectrode through its holder,.

self-acting means to raise said upper electrode and its holder, and amovable support for the lower electrode having a yielding backin gtoaccommodate excess pressure upon the work and lower electrode.

16. In an electric riveting machine, an upper and lower electrode andindependently movable holders therefor, a yielding bumper for one ofsaid holders and a striking hammer and separate presser member for theother holder. and independent operating means for said hammer andpresser member, respectively. v

17 In electric riveting machines, a set of electrodes having separateholders, a movable head for one of said holders, a striking hammer and aseparate presser member for said head, power applying means for saidhammer, a treadle and means connected therewith to control the operationof saidv power applying means, and a manuallyoperable device for saidpresser member, in combination with electrical means to transmit anelectric heating current to said electrodes during riveting operations.

18. Inxan electric riveting machine, a set of electrodes, a slidablehead carrying one of said electrodes, a member to depress said head alever to operate said member, an electric switch havlng a handle mounted'upon said lever for joint operation of the device, and a treadle andoperating connections for said clutch mechanism.

In testimony whereof I affix my signature in presence of two witnesses.

ALBERTIS C. TAYLOR. Vitnesses A. E. TONDUS, J. H. EWALT.

